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You might get somewhere by some simpler method, for instance compute the marginal pixel sum along verticals divide the image in horizontal stripes, cutting where 1. is zero -> this isolates pentagrams for each of these stripes, compute the horizontal sum a candidate staff is defined in terms of thresholds: the marginal sum of black pixels must be high enough and wide enough (staffs are thicker than note stems) check in each of these locations that [a slight morphological dilation of] the black pixels is exactly five lines high, and pass/fail which of course assumes that the score has been properly oriented in preprocessing. And still imperfections on the scanned image may fool a simple detection approach; for example the semibischroma D at bar 3 might provide a false staff positive. All together I think complex pattern detection is an art. If there is any attempt of OCM out there, it has really be smarter than any simple scheme like I could think of.

As for a labview wrapper to opencv, I'm only aware of this one (once downloaded but never tried). I'ts all: commercial, closed-source, only windows (and probably only x86), bound to an old opencv version. Given the complexity of opencv though, I think any full scale interface to it would be a major project. I'm not familiar with OMR, but I have done quite some OCR of historical books. For that I actually relied on an existing OS package, tesseract, which is not even the best performing around, but would never have dreamed to implement OCR from scratch using labview [yes there may be some IMAQ "OCR"; but seriously]. Well maybe I could have used labview for just some routinary image rectification and preprocessing task, but it turns there are better ready made tools around, e.g. scantailor. I don't know where you stand in this respect, but if there is some decent OMR around I would stick to it and at best call it from labview if I really had to. Out of curiosity because I don't know OMR workings: does removing the staffs in preprocessing really help the recognition, not complicate it? Well ok, the rhythm of your music is weird, I don't see any two bars with the same duration...